summaryrefslogtreecommitdiff
path: root/scheduler.c
blob: 4687231abfa1c6d0588156550c2b07bbf4162366 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
/**********************************************************************

  scheduler.c

  $Author$

  Copyright (C) 2020 Samuel Grant Dawson Williams

**********************************************************************/

#include "vm_core.h"
#include "ruby/fiber/scheduler.h"
#include "ruby/io.h"

static ID id_close;

static ID id_block;
static ID id_unblock;

static ID id_kernel_sleep;
static ID id_process_wait;

static ID id_io_read;
static ID id_io_write;
static ID id_io_wait;

void
Init_Fiber_Scheduler(void)
{
    id_close = rb_intern_const("close");

    id_block = rb_intern_const("block");
    id_unblock = rb_intern_const("unblock");

    id_kernel_sleep = rb_intern_const("kernel_sleep");
    id_process_wait = rb_intern_const("process_wait");

    id_io_read = rb_intern_const("io_read");
    id_io_write = rb_intern_const("io_write");
    id_io_wait = rb_intern_const("io_wait");
}

VALUE
rb_fiber_scheduler_get(void)
{
    rb_thread_t *thread = GET_THREAD();
    VM_ASSERT(thread);

    return thread->scheduler;
}

VALUE
rb_fiber_scheduler_set(VALUE scheduler)
{
    rb_thread_t *thread = GET_THREAD();
    VM_ASSERT(thread);

    // We invoke Scheduler#close when setting it to something else, to ensure the previous scheduler runs to completion before changing the scheduler. That way, we do not need to consider interactions, e.g., of a Fiber from the previous scheduler with the new scheduler.
    if (thread->scheduler != Qnil) {
        rb_fiber_scheduler_close(thread->scheduler);
    }

    thread->scheduler = scheduler;

    return thread->scheduler;
}

static VALUE
rb_fiber_scheduler_current_for_threadptr(rb_thread_t *thread)
{
    VM_ASSERT(thread);

    if (thread->blocking == 0) {
        return thread->scheduler;
    } else {
        return Qnil;
    }
}

VALUE
rb_fiber_scheduler_current(void)
{
    return rb_fiber_scheduler_current_for_threadptr(GET_THREAD());
}

VALUE rb_fiber_scheduler_current_for_thread(VALUE thread)
{
    return rb_fiber_scheduler_current_for_threadptr(rb_thread_ptr(thread));
}

VALUE
rb_fiber_scheduler_close(VALUE scheduler)
{
    if (rb_respond_to(scheduler, id_close)) {
        return rb_funcall(scheduler, id_close, 0);
    }

    return Qnil;
}

VALUE
rb_fiber_scheduler_make_timeout(struct timeval *timeout)
{
    if (timeout) {
        return rb_float_new((double)timeout->tv_sec + (0.000001f * timeout->tv_usec));
    }

    return Qnil;
}

VALUE
rb_fiber_scheduler_kernel_sleep(VALUE scheduler, VALUE timeout)
{
    return rb_funcall(scheduler, id_kernel_sleep, 1, timeout);
}

VALUE
rb_fiber_scheduler_kernel_sleepv(VALUE scheduler, int argc, VALUE * argv)
{
    return rb_funcallv(scheduler, id_kernel_sleep, argc, argv);
}

VALUE
rb_fiber_scheduler_process_wait(VALUE scheduler, rb_pid_t pid, int flags)
{
    VALUE arguments[] = {
        PIDT2NUM(pid), RB_INT2NUM(flags)
    };
  
    return rb_check_funcall(scheduler, id_process_wait, 2, arguments);
}

VALUE
rb_fiber_scheduler_block(VALUE scheduler, VALUE blocker, VALUE timeout)
{
    return rb_funcall(scheduler, id_block, 2, blocker, timeout);
}

VALUE
rb_fiber_scheduler_unblock(VALUE scheduler, VALUE blocker, VALUE fiber)
{
    return rb_funcall(scheduler, id_unblock, 2, blocker, fiber);
}

VALUE
rb_fiber_scheduler_io_wait(VALUE scheduler, VALUE io, VALUE events, VALUE timeout)
{
    return rb_funcall(scheduler, id_io_wait, 3, io, events, timeout);
}

VALUE
rb_fiber_scheduler_io_wait_readable(VALUE scheduler, VALUE io)
{
    return rb_fiber_scheduler_io_wait(scheduler, io, RB_UINT2NUM(RUBY_IO_READABLE), Qnil);
}

VALUE
rb_fiber_scheduler_io_wait_writable(VALUE scheduler, VALUE io)
{
    return rb_fiber_scheduler_io_wait(scheduler, io, RB_UINT2NUM(RUBY_IO_WRITABLE), Qnil);
}

VALUE
rb_fiber_scheduler_io_read(VALUE scheduler, VALUE io, VALUE buffer, size_t offset, size_t length)
{
    VALUE arguments[] = {
        io, buffer, SIZET2NUM(offset), SIZET2NUM(length)
    };
  
    return rb_check_funcall(scheduler, id_io_read, 4, arguments);
}

VALUE
rb_fiber_scheduler_io_write(VALUE scheduler, VALUE io, VALUE buffer, size_t offset, size_t length)
{
    VALUE arguments[] = {
        io, buffer, SIZET2NUM(offset), SIZET2NUM(length)
    };

    // We should ensure string has capacity to receive data, and then resize it afterwards.
    return rb_check_funcall(scheduler, id_io_write, 4, arguments);
}